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Project : Cool

Ok, my first project is a replacement for a previous gadget I’d knocked up to cool my devices under my TV, as they are in a new cabinet with very little vertical headroom.

The current one just adjusts the voltage to the 12v PC fan with the aid of a variable resistor, and a thermistor. Set to the right value, the voltage to the fan increases to its startup level when the temp goes a few degrees above ambient.

My brief for my Arduino powered one is to use a PWM fan, and adjusting the ‘duty cycle’ based on the analogue input from the thermistor. Also, I wanted to add an LED for feedback, and a transistor to turn off the fan completely when the temperature is around room temp.